package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @Author:ZouChou
 * @Description:
 * @Date:Created in 20:24 2024/4/23
 * @Modified By:
 */

/**
 * 1.切面：切面就是通知和切点的结合
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     *切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 通知
     * @param
     */
    @Before("autoFillPointCut()")//在方法执行前执行
    public void autoFill(JoinPoint joinPoint)  {
        log.info("公共字段自动填充");

        //获取当前被拦截方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解
        OperationType operationType = autoFill.value();//获取数据库操作类型
        //获取当前被拦截方法的参数
        Object[] args = joinPoint.getArgs();//获取参数
        if (args.length == 0 || args[0] == null) {
            return;
        }
        Object entity = args[0];

        //获取准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据数据库操作类型，给对应的参数赋值
        if (operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                //通过反射调用方法
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);


            } catch (Exception e) {
                throw new RuntimeException(e);
        }
        }else if (operationType == OperationType.UPDATE){
                try {
                    Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                    //通过反射调用方法
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);

                }catch (Exception e){
                    throw new RuntimeException(e);
                }
            }
        }



    }


